On the Mechanism of Grain Refinement by Ultrasonic Melt Treatment in the Presence of Transition Metals

Eskin, Dmitry; Atamanenko, T.V.; Zhang, L.; Katgerman, L.

doi:10.1002/9781118647783.ch51

Cited by 5 publications

(5 citation statements)

References 13 publications

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“…It has been inferred that the primary sources of refining primary Al phase and changes in microstructure concerning the phase transformation and morphological evolution of alloys by UST are the collapse of small cavities, dendritic fragmentation, and wetting due to the cavitation-induced nucleation mechanism. As some researchers demonstrated, the improvements in microstructure and mechanical properties arise from cavitation induced heterogeneous nucleation [8, 12, 17, 19, 29-31, 33, 34] and fragmentation of the dendritic structure [15,22,23,25] due to ultrasonic vibration. As previously mentioned in this study, ultrasonic vibration was applied at a fully liquid state (at 700 • C) of AlSi10Mg alloy.…”

Section: Discussionmentioning

confidence: 99%

“…Besides, the ultimate tensile strength and elongation at break increased, and grain size decreased with increasing ultrasonic power [8]. The results have shown that ultrasonic vibration application during solidification of aluminum alloys is more efficient when the transition metals such as Zr and Ti are present in the alloy [23]. Different than extensively examined aluminum alloys, the effects of ultrasonic vibration on the microstructure and mechanical properties on Mg-8Li-3Al [24], AS41 [25], Al-4Mg [26] alloys and 35CrMo steel [27] were investigated.…”

Section: Introductionmentioning

confidence: 91%

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Improving mechanical properties of AlSi10Mg aluminum alloy using ultrasonic melt treatment combined with T6 heat treatment

Vatansever¹,

Ertürk²,

Karabay³

2020

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The purpose of this study is examining the effects of ultrasonic melt treatment on microstructure and mechanical properties of the AlSi10Mg alloy. In this study, ultrasonic melt treatment with different frequencies and duration was applied to AlSi10Mg molten alloy. Also, T6 heat treatment was applied to samples which were obtained by ultrasonic melt treatment (UST) with different application parameters to investigate the combination of T6 heat treatment and UST effect on the microstructure and mechanical properties. The microstructure of cast samples was characterized by optical and scanning electron microscopy. Also, hardness and tensile tests were carried out. The results indicate that primary α-Al phases are transformed from coarse dendrites to smaller dendrites by the ultrasonic melt treatment. Besides, secondary dendrite arm spacing of the alloy decreased and mechanical properties such as hardness and tensile strength increased. UST reduces the secondary dendrite arm spacing (SDAS) of the aluminum alloy to 50 %. Additionally, increasing treatment time contributes to hardness up to 12 % and tensile strength up to 50 %.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

Improving mechanical properties of AlSi10Mg aluminum alloy using ultrasonic melt treatment combined with T6 heat treatment

Vatansever¹,

Ertürk²,

Karabay³

2020

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“…(1) Therefore, degassing process and grain refinement treatment are the most important operations affecting the performance of casting process [1]. There are various processes to reduce hydrogen amount in molten aluminum, such as; hexachloroethane (C2Cl6) pellets, vacuum degassing [7] and ultrasonic degassing [13][14][15]. The first mentioned degassing process is harmful for the environment [16] due to the release of dangerous Cl2 gases into the atmosphere [17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasonic Treatment Parameters on Microstructural and Mechanical Properties of A356 Aluminum Alloy

Aybarç¹,

Dokumacı

Önel

2020

International Journal of Automotive Science and Technology

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The aim of this study is to investigate the effect of ultrasonic treatment on the microstructural and mechanical properties of A356 aluminum al-loy. Ultrasonic treatment was applied to 2 kg and 4 kg molten metals at different melting temperatures (700 oC, 720 oC and 740 oC) for different durations (0, 60, 180 and 300 seconds). Bifilm indices of the samples were also measured after all parameters were tested. The ultimate tensile strength (UTS) and elongation values were used to calculate the Quality Index (QI) of the samples. According to the results, the amount of liquid metal directly affects the the ultrasonic intensity that is produced during the treatment. Maximum UTS and elongation results were determined at 720 oC during 300 seconds for 4 kg casting. Minimum bifilm density val-ue was measured at the same ultrasonic temperature and time.

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“…In the area of the solidification of metallic materials, ultrasonic vibration can effectively grain-refine both aluminium and magnesium alloys [3,5]. Ultrasonic melt treatment (UST) is known to induce refining effect in aluminum alloys [6][7][8][9][10][11]. The basic principle is introduction of acoustic waves with a frequency higher than 17 kHz into liquid metal.…”

Section: Introductionmentioning

confidence: 99%

The effect of magnesium doped on microstructure of aluminum alloy under ultrasonic vibration

Li¹,

Li²

2015

Proceedings of the 2015 International Conference on Materials, Environmental and Biological Engineering

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Aluminum has great application in the machinery, transportation, aviation and military and other fields, because of its light weight, rich in resources, good comprehensive properties. Structure determines the properties, in order to obtain good properties, the key is to get the fine and uniform equiaxed grain. In order to obtain the high quality aluminum alloy of fine and uniform equiaxed grain, we must control the growth of grain in the casting process. This paper mainly discusses the effect of magnesium doped on microstructure and properties of aluminum alloy under ultrasonic vibration. Adding Mg of different content for 1wt%, 3wt%, 5wt%, 7wt%, 9wt%, 15wt% in pure aluminum, respectively, then solidifying under ultrasonic vibration. The effect of different solute content on the microstructure of aluminum alloy under ultrasonic vibration is studied. The result shows that aluminum alloy containing 9wt.% magnesium can achieve the best effect of grain refinement under ultrasonic vibration.

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On the Mechanism of Grain Refinement by Ultrasonic Melt Treatment in the Presence of Transition Metals

Cited by 5 publications

References 13 publications

Improving mechanical properties of AlSi10Mg aluminum alloy using ultrasonic melt treatment combined with T6 heat treatment

Improving mechanical properties of AlSi10Mg aluminum alloy using ultrasonic melt treatment combined with T6 heat treatment

Effect of Ultrasonic Treatment Parameters on Microstructural and Mechanical Properties of A356 Aluminum Alloy

The effect of magnesium doped on microstructure of aluminum alloy under ultrasonic vibration

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